幼若歯に対するEr:YAGレーザーの照射影響-第1報in vitro照射による熱影響について-

DOI 被引用文献4件 参考文献27件

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  • Effects of Er: YAG Laser Irradiation on Immature Teeth -First report In vitro study of heat effects on the pulpal dentin-

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To investigate the effectiveness and safety of clinical application of the Er: YAG laser used for cavity preparation in pediatric dentistry, the effects of heat on the dental hard tissue and pulp were examined. Human immature permanent premolars with incomplete apices that had been extracted for orthodontic treatment were chosen for the experiment. After the occlusal surface of the specimen was reduced to expose the dentin so that the thickness of the dentin was either 1.0 or 1.5 mm, the specimens were irradiated at 50,100 or 150 mJ/pulse, and 10 pps while spraying with water. For laser irradiation, the contact tip of 0.6 mm in diameter was held in contact with the specimen. The irradiation time was either 2,5, or 10 s, and 5 specimens were irradiated for each irradiation condition and each dentin thickness (total 90 specimens). Changes in the temperature were measured using an alumelchromel thermocouple, and the mean value and standard deviation were determined for each of the 5specimens. The influences of the irradiation time and the dentin thickness were examined by comparing changes in the temperature for each irradiation condition.<BR>1. The rise in temperature rise resulting from irradiation increased in accordance with the energy of the radiation, the period of irradiation, and the thickness of the dentin.<BR>2. The temperature of the pulpal dentin rose due to laser irradiation, but with sufficient water spray, the average rise in temperature was maintained under 5 degrees under all irradiation conditions, indicating the absence of adverse effects on the pulp.<BR>3. When irradiation was performed at 150 mJ/pulse with an exposure time of 5 s or 10 s, some individuals showed more than 5 degrees of maximal increases in temperature, suggesting possible adverse effects on the pulp in some individuals.

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